39 lines
900 B
Go
39 lines
900 B
Go
//go:build darwin
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// +build darwin
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package freeport
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import (
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"fmt"
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"os/exec"
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"regexp"
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"strconv"
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)
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const ephemeralPortRangeSysctlFirst = "net.inet.ip.portrange.first"
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const ephemeralPortRangeSysctlLast = "net.inet.ip.portrange.last"
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var ephemeralPortRangePatt = regexp.MustCompile(`^\s*(\d+)\s+(\d+)\s*$`)
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func getEphemeralPortRange() (int, int, error) {
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cmd := exec.Command("/usr/sbin/sysctl", "-n", ephemeralPortRangeSysctlFirst, ephemeralPortRangeSysctlLast)
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out, err := cmd.Output()
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if err != nil {
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return 0, 0, err
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}
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val := string(out)
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m := ephemeralPortRangePatt.FindStringSubmatch(val)
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if m != nil {
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min, err1 := strconv.Atoi(m[1])
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max, err2 := strconv.Atoi(m[2])
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if err1 == nil && err2 == nil {
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return min, max, nil
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}
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}
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return 0, 0, fmt.Errorf("unexpected sysctl value %q for keys %q, %q", val, ephemeralPortRangeSysctlFirst, ephemeralPortRangeSysctlLast)
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}
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